Mormons what is the purpose of the veil? The one that was placed over our eyes at birth?

Whats the point of a test when someone sits the answer key in front of you?? It tests YOU in no way whatsoever. If Hitler was a good person, he would have been good on earth. You want to know what people are like when no ones looking?? Then they have to really think no ones looking. Thats when you see peoples true colors. I dont see how this is a difficult concept.